a )
( 410 - t ) : 7 + 70 = 120
( 410 - t ) : 7 = 120 - 70
( 410 - t ) : 7 = 50
410 - t = 50 × 7
410 - t = 350
t = 410 - 350
t = 60 → numarul, aflat prin metoda mersului invers
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b)
( z : 9 ) × 15 - 47 = 28
( z : 9 ) × 15 = 28 + 47
( z : 9 ) × 15 = 75
z : 9 = 75 : 15
z : 9 = 5
z = 5 × 9
z = 45
Verific: ( 45 : 9 ) × 15 - 47 = 5 × 15 - 47 = 75 - 47 = 28
